Watch https://www.youtube.com/watch?v=ocF_hrr83Oc and he seems to have tracked them down.
Frankly, let him do the repair.
i'm trying to repair a macbook a1286 (i understood the model looking pictures online cause the serial was scratched away from the cover....the logic board just say 2009)
anyway, it won't turn on
if i'm going to measure on the power regulation i can see 3.3V but i do not have 5V
trying to bypass the thing, i discover that if i get rid on one or two power MOSes suddenly i can see 5V, but it won't turn anyway
i'm doing all of this without schematics cause i can't find any
please help me out